Match the following:
$$\begin{array}{ll}\text{(a) Kot Diji}& \text{1. Luigi Pio Tessitori}\\ \text{(b) Harappa}& \text{2. F.A. Khan, G.S. Ghurye}\\ \text{(c) Kalibangan}& \text{3. Daya Ram Sahani}\\ \text{(d) Mohenjodaro}& \text{4. Rakhal Das Bandyopadhyay}\end{array}$$

Matching the Indus Valley Civilization sites with their respective discoverers/excavators:
* (a) Kot Diji was excavated by F.A. Khan $⟹2$
* (b) Harappa was discovered by Rai Bahadur Daya Ram Sahni in $1921⟹3$
* (c) Kalibangan was initially identified by Luigi Pio Tessitori and later excavated by Amlanand Ghosh $⟹1$
* (d) Mohenjodaro was discovered by Rakhal Das Bandyopadhyay (R.D. Banerjee) in $1922⟹4$

Thus, the correct sequence is (a - 2), (b - 3), (c - 1), (d - 4).